このソースコードは、nozimaの日記 C#でOAuthでTwitterをそのまま持って来ました。
「上のコードは、パブリックドメインということにします。御自由にお使いください。」
とありますので、解説等々はありません。
<ここからソースコード>
/*
* 参考サイト
* http://d.hatena.ne.jp/nojima718/20100129/1264792636
*
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Security.Cryptography;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Web;
using System.Net;
using System.IO;
using System.Diagnostics;
namespace MyTwitter
{
public class MyTwitterAuth
{
const string REQUEST_TOKEN_URL = "https://twitter.com/oauth/request_token";
const string ACCESS_TOKEN_URL = "https://twitter.com/oauth/access_token";
const string AUTHORIZE_URL = "https://twitter.com/oauth/authorize";
private Random random = new Random();
public string ConsumerKey { get; private set; }
public string ConsumerSecret { get; private set; }
public string RequestToken { get; private set; }
public string RequestTokenSecret { get; private set; }
public string AccessToken { get; private set; }
public string AccessTokenSecret { get; private set; }
public string UserId { get; private set; }
public string ScreenName { get; private set; }
public MyTwitterAuth(string consumerKey, string consumerSecret)
{
ServicePointManager.Expect100Continue = false;
ConsumerKey = consumerKey;
ConsumerSecret = consumerSecret;
}
public MyTwitterAuth(string consumerKey, string consumerSecret, string accessToken, string accessTokenSecret, string userId, string screenName)
{
ServicePointManager.Expect100Continue = false;
ConsumerKey = consumerKey;
ConsumerSecret = consumerSecret;
AccessToken = accessToken;
AccessTokenSecret = accessTokenSecret;
UserId = userId;
ScreenName = screenName;
}
public void GetRequestToken()
{
SortedDictionary parameters = GenerateParameters("");
string signature = GenerateSignature("", "GET", REQUEST_TOKEN_URL, parameters);
parameters.Add("oauth_signature", UrlEncode(signature));
string response = HttpGet(REQUEST_TOKEN_URL, parameters);
Dictionary dic = ParseResponse(response);
RequestToken = dic["oauth_token"];
RequestTokenSecret = dic["oauth_token_secret"];
}
public string GetAuthorizeUrl()
{
return AUTHORIZE_URL + "?oauth_token=" + RequestToken;
}
public void GetAccessToken(string pin)
{
SortedDictionary parameters = GenerateParameters(RequestToken);
parameters.Add("oauth_verifier", pin);
string signature = GenerateSignature(RequestTokenSecret, "GET", ACCESS_TOKEN_URL, parameters);
parameters.Add("oauth_signature", UrlEncode(signature));
string response = HttpGet(ACCESS_TOKEN_URL, parameters);
Dictionary dic = ParseResponse(response);
AccessToken = dic["oauth_token"];
AccessTokenSecret = dic["oauth_token_secret"];
UserId = dic["user_id"];
ScreenName = dic["screen_name"];
}
public string Get(string url, IDictionary parameters)
{
SortedDictionary parameters2 = GenerateParameters(AccessToken);
foreach (var p in parameters)
parameters2.Add(p.Key, p.Value);
string signature = GenerateSignature(AccessTokenSecret, "GET", url, parameters2);
parameters2.Add("oauth_signature", UrlEncode(signature));
return HttpGet(url, parameters2);
}
public string Post(string url, IDictionary parameters)
{
SortedDictionary parameters2 = GenerateParameters(AccessToken);
foreach (var p in parameters)
parameters2.Add(p.Key, p.Value);
string signature = GenerateSignature(AccessTokenSecret, "POST", url, parameters2);
parameters2.Add("oauth_signature", UrlEncode(signature));
return HttpPost(url, parameters2);
}
private string HttpGet(string url, IDictionary parameters)
{
WebRequest req = WebRequest.Create(url + '?' + JoinParameters(parameters));
WebResponse res = req.GetResponse();
Stream stream = res.GetResponseStream();
StreamReader reader = new StreamReader(stream);
string result = reader.ReadToEnd();
reader.Close();
stream.Close();
return result;
}
string HttpPost(string url, IDictionary parameters)
{
//変数宣言
byte[] data = Encoding.ASCII.GetBytes(JoinParameters(parameters));
WebRequest req = WebRequest.Create(url);
//書き込み用変数設定
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = data.Length;
//ストリーミングで書き込み
Stream reqStream = req.GetRequestStream();
reqStream.Write(data, 0, data.Length);
reqStream.Close();
//書き込み確認(読み込み)
WebResponse res = req.GetResponse();
Stream resStream = res.GetResponseStream();
StreamReader reader = new StreamReader(resStream, Encoding.UTF8);
string result = reader.ReadToEnd();
reader.Close();
resStream.Close();
return result;
}
private Dictionary ParseResponse(string response)
{
Dictionary result = new Dictionary();
foreach (string s in response.Split('&'))
{
int index = s.IndexOf('=');
if (index == -1)
result.Add(s, "");
else
result.Add(s.Substring(0, index), s.Substring(index + 1));
}
return result;
}
private string JoinParameters(IDictionary parameters)
{
StringBuilder result = new StringBuilder();
bool first = true;
foreach (var parameter in parameters)
{
if (first)
first = false;
else
result.Append('&');
result.Append(parameter.Key);
result.Append('=');
result.Append(parameter.Value);
}
return result.ToString();
}
private string GenerateSignature(string tokenSecret, string httpMethod, string url, SortedDictionary parameters)
{
string signatureBase = GenerateSignatureBase(httpMethod, url, parameters);
HMACSHA1 hmacsha1 = new HMACSHA1();
hmacsha1.Key = Encoding.ASCII.GetBytes(UrlEncode(ConsumerSecret) + '&' + UrlEncode(tokenSecret));
byte[] data = System.Text.Encoding.ASCII.GetBytes(signatureBase);
byte[] hash = hmacsha1.ComputeHash(data);
return Convert.ToBase64String(hash);
}
private string GenerateSignatureBase(string httpMethod, string url, SortedDictionary parameters)
{
StringBuilder result = new StringBuilder();
result.Append(httpMethod);
result.Append('&');
result.Append(UrlEncode(url));
result.Append('&');
result.Append(UrlEncode(JoinParameters(parameters)));
return result.ToString();
}
private SortedDictionary GenerateParameters(string token)
{
SortedDictionary result = new SortedDictionary();
result.Add("oauth_consumer_key", ConsumerKey);
result.Add("oauth_signature_method", "HMAC-SHA1");
result.Add("oauth_timestamp", GenerateTimestamp());
result.Add("oauth_nonce", GenerateNonce());
result.Add("oauth_version", "1.0");
if (!string.IsNullOrEmpty(token))
result.Add("oauth_token", token);
return result;
}
public string UrlEncode(string value)
{
string unreserved = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";
StringBuilder result = new StringBuilder();
byte[] data = Encoding.UTF8.GetBytes(value);
foreach (byte b in data)
{
if (b < 0x80 && unreserved.IndexOf((char)b) != -1)
result.Append((char)b);
else
result.Append('%' + String.Format("{0:X2}", (int)b));
}
return result.ToString();
}
private string GenerateNonce()
{
string letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
StringBuilder result = new StringBuilder(8);
for (int i = 0; i < 8; ++i)
result.Append(letters[random.Next(letters.Length)]);
return result.ToString();
}
private string GenerateTimestamp()
{
TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
return Convert.ToInt64(ts.TotalSeconds).ToString();
}
}
}
<ここまでソースコード>